/*

 * Licensed to the Apache Software Foundation (ASF) under one

 * or more contributor license agreements.  See the NOTICE file

 * distributed with this work for additional information

 * regarding copyright ownership.  The ASF licenses this file

 * to you under the Apache License, Version 2.0 (the

 * "License"); you may not use this file except in compliance

 * with the License.  You may obtain a copy of the License at

 *

 *     http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

package com.bff.gaia.unified.sdk.extensions.sql.impl.rel;



import com.bff.gaia.unified.sdk.extensions.sql.UnifiedSqlTable;

import com.bff.gaia.unified.sdk.extensions.sql.impl.rule.UnifiedIOSinkRule;

import com.bff.gaia.unified.sdk.transforms.PTransform;

import com.bff.gaia.unified.sdk.values.PCollection;

import com.bff.gaia.unified.sdk.values.PCollectionList;

import com.bff.gaia.unified.sdk.values.Row;

import org.apache.calcite.plan.RelOptCluster;

import org.apache.calcite.plan.RelOptPlanner;

import org.apache.calcite.plan.RelOptTable;

import org.apache.calcite.plan.RelTraitSet;

import org.apache.calcite.prepare.Prepare;

import org.apache.calcite.rel.RelNode;

import org.apache.calcite.rel.core.TableModify;

import org.apache.calcite.rex.RexNode;

import org.apache.calcite.sql2rel.RelStructuredTypeFlattener;



import java.util.List;

import java.util.Map;



import static com.bff.gaia.unified.vendor.guava.com.google.common.base.Preconditions.checkArgument;



/** UnifiedRelNode to replace a {@code TableModify} node. */

public class UnifiedIOSinkRel extends TableModify

    implements UnifiedRelNode, RelStructuredTypeFlattener.SelfFlatteningRel {



  private final UnifiedSqlTable sqlTable;

  private final Map<String, String> pipelineOptions;

  private boolean isFlattening = false;



  public UnifiedIOSinkRel(

      RelOptCluster cluster,

      RelOptTable table,

      Prepare.CatalogReader catalogReader,

      RelNode child,

      Operation operation,

      List<String> updateColumnList,

      List<RexNode> sourceExpressionList,

      boolean flattened,

      UnifiedSqlTable sqlTable,

      Map<String, String> pipelineOptions) {

    super(

        cluster,

        cluster.traitSetOf(UnifiedLogicalConvention.INSTANCE),

        table,

        catalogReader,

        child,

        operation,

        updateColumnList,

        sourceExpressionList,

        flattened);

    this.sqlTable = sqlTable;

    this.pipelineOptions = pipelineOptions;

  }



  @Override

  public RelNode copy(RelTraitSet traitSet, List<RelNode> inputs) {

    boolean flattened = isFlattened() || isFlattening;

    UnifiedIOSinkRel newRel =

        new UnifiedIOSinkRel(

            getCluster(),

            getTable(),

            getCatalogReader(),

            sole(inputs),

            getOperation(),

            getUpdateColumnList(),

            getSourceExpressionList(),

            flattened,

            sqlTable,

            pipelineOptions);

    newRel.traitSet = traitSet;

    return newRel;

  }



  @Override

  public void flattenRel(RelStructuredTypeFlattener flattener) {

    // rewriteGeneric calls this.copy. Setting isFlattining passes

    // this context into copy for modification of the flattened flag.

    isFlattening = true;

    flattener.rewriteGeneric(this);

    isFlattening = false;

  }



  @Override

  public void register(RelOptPlanner planner) {

    planner.addRule(UnifiedIOSinkRule.INSTANCE);

    super.register(planner);

  }



  @Override

  public PTransform<PCollectionList<Row>, PCollection<Row>> buildPTransform() {

    return new Transform();

  }



  private class Transform extends PTransform<PCollectionList<Row>, PCollection<Row>> {



    @Override

    public PCollection<Row> expand(PCollectionList<Row> pinput) {

      checkArgument(

          pinput.size() == 1,

          "Wrong number of inputs for %s: %s",

          UnifiedIOSinkRel.class.getSimpleName(),

          pinput);

      PCollection<Row> input = pinput.get(0);



      sqlTable.buildIOWriter(input);



      return input;

    }

  }



  @Override

  public Map<String, String> getPipelineOptions() {

    return pipelineOptions;

  }

}